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mrs_skeptik [129]

3 years ago

10

The ph of two lakes is measured. Lake a has a ph of 8.0; lake b has a ph of 6.0. Which of thefollowing statements is correct abo

ut these lakes?

1 answer:

Gnom [1K]3 years ago

7 0

Can you complete your question ?
Given the pH you can say that lake A is Basic and lake B is Acidic because of their pH.

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If 4.168 kJ of heat is added to a calorimeter containing 75.40 g of water, the temperature of the water and the calorimeter incr

Savatey [412]

Answer:

The value of the heat capacity of the Calorimeter $C_c$ = 54.4 $\frac{J}{c}$

Explanation:

Given data

Heat added Q = 4.168 KJ = 4168 J

Mass of water $m_w$ = 75.40 gm

Temperature change = ΔT = 35.82 - 24.58 = 11.24 ° c

From the given condition

Q = $m_w C_w$ ΔT + $C_c$ ΔT

Put all the values in above equation we get

4168 = 75.70 × 4.18 × 11.24 + $C_c$ × 11.24

611.37 = $C_c$ × 11.24

$C_c$ = 54.4 $\frac{J}{c}$

This is the value of the heat capacity of the Calorimeter.

5 0

3 years ago

An element belongs to the period 4 and group VB, write down its electron configuration?

Serjik [45]

Answer:

her 56th album was the only way of her career to village in a few hours of her 6AM career as a job creation in a day and a day 5th century fox in a few hours of

4 0

3 years ago

A 200.0 mL solution of 0.40 M ammonium chloride was titrated with 0.80 M sodium hydroxide. What was the pH of the solution after

Rus_ich [418]

Answer:

pH = 9.25

Explanation:

Step 1: Data given

Volume of a 0.40 M NH4Cl solution = 200.0 mL = 0.200 L

Molarity of NaOH = 0.80 M

Volume of NaOH = 50.0 mL

The Kb of ammonia is 1.76×10^-5

Step 2: The balanced equation

NH4Cl + NaOH → NH3 + NaCl + H2O

Step 3: Calculate moles

Moles NH4Cl = molarity *¨volume

Moles NH4Cl = 0.40 M * 0.200 L = 0.08 moles

Moles NaOH = 0.80 M * 0.050 L = 0.04 moles

Step 4: Calculate limiting reactant

NaOH will completely be consumed. (0.04 moles). NH44Cl is in excess. There will react 0.04 moles .there will remain 0.04 moles.

Step 5: Calculate moles NH3

Moles NH3 = for 0.4 moles NH4Cl we'll have 0.4 moles NH3

Step 6: Calculate molarity

Molarity = moles / volume

Molarity = 0.4 moles = 0.250 L

Molarity = 1.6 M

Step 7: Calculate pOH

pOH = pKb + log ([B+]/[BOH])

pOH = 4.75 + log (1.6 / 1.6)

pOH = 4.75

Step 8: Calculate pH

pH = 14 - 4.75

pH = 9.25

3 0

3 years ago

Proper chemical storage includes

Dmitrij [34]

A proper chemical storage includes the following;

- Management – this includes of managing the storage area of the chemical and how they are stored base on their difference and property

- Compliance – this is the action needed in means of having to be able to understand the properties of the chemical in order to know what action is needed to engaged on

6 0

3 years ago

Which of these are chemical changes??

Vedmedyk [2.9K]

Mud dries and changes to dust. A match stick turns to ash while burning. stomach acids dessolving pizza. grape juice fermenting into wine. an iron pipe rusting. when in doubt if something is chemical or physical, know that physical changes can be state changes like condensation, melting, evaporation, freezing, etc. If a leaf is cut up, it is still a leaf, no matter how many times you cut it. if whats happening is changing what it is made of its a chemical change. hope this helped :)

6 0

3 years ago